A cron job will only run once a minute, not wake up every second. But you could write a PHP program that does a one-second sleep before checking if there's something to do, and a batch job that runs periodically to see if the PHP program is running, and if not, launch it.
That's how I handle a job that opens a tunnel from our PostgreSQL server to a MySQL server running at AWS so we can synchronize data between those two database servers. It dies periodically for reasons we've never figured out, so every 5 minutes I check to make sure it's running.
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